[PATCH 4/4] drm/amdgpu: avoid dump mca bank log muti times during ras ISR

[Yang Wang]

because the ue valid mca count will only be cleared after gpu reset,
so only dump mca log on the first time to get mca bank after receive RAS interrupt.

Signed-off-by: Yang Wang <kevinyang.wang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c | 28 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_mca.h |  1 +
 2 files changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
index 264f56fd4f66..b581523fa8d7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
@@ -229,6 +229,8 @@ int amdgpu_mca_init(struct amdgpu_device *adev)
 	struct mca_bank_cache *mca_cache;
 	int i;
 
+	atomic_set(&mca->ue_update_flag, 0);
+
 	for (i = 0; i < ARRAY_SIZE(mca->mca_caches); i++) {
 		mca_cache = &mca->mca_caches[i];
 		mutex_init(&mca_cache->lock);
@@ -244,6 +246,8 @@ void amdgpu_mca_fini(struct amdgpu_device *adev)
 	struct mca_bank_cache *mca_cache;
 	int i;
 
+	atomic_set(&mca->ue_update_flag, 0);
+
 	for (i = 0; i < ARRAY_SIZE(mca->mca_caches); i++) {
 		mca_cache = &mca->mca_caches[i];
 		amdgpu_mca_bank_set_release(&mca_cache->mca_set);
@@ -325,6 +329,27 @@ static int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device *adev, enum amdgpu_
 	return mca_funcs->mca_get_mca_entry(adev, type, idx, entry);
 }
 
+static bool amdgpu_mca_bank_should_update(struct amdgpu_device *adev, enum amdgpu_mca_error_type type)
+{
+	struct amdgpu_mca *mca = &adev->mca;
+	bool ret = true;
+
+	/*
+	 * Because the UE Valid MCA count will only be cleared after reset,
+	 * in order to avoid repeated counting of the error count,
+	 * the aca bank is only updated once during the gpu recovery stage.
+	 */
+	if (type == AMDGPU_MCA_ERROR_TYPE_UE) {
+		if (amdgpu_ras_intr_triggered())
+			ret = atomic_cmpxchg(&mca->ue_update_flag, 0, 1) == 0;
+		else
+			atomic_set(&mca->ue_update_flag, 0);
+	}
+
+	return ret;
+}
+
+
 static int amdgpu_mca_smu_get_mca_set(struct amdgpu_device *adev, enum amdgpu_mca_error_type type, struct mca_bank_set *mca_set,
 				      struct ras_query_context *qctx)
 {
@@ -335,6 +360,9 @@ static int amdgpu_mca_smu_get_mca_set(struct amdgpu_device *adev, enum amdgpu_mc
 	if (!mca_set)
 		return -EINVAL;
 
+	if (!amdgpu_mca_bank_should_update(adev, type))
+		return 0;
+
 	ret = amdgpu_mca_smu_get_valid_mca_count(adev, type, &count);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.h
index 9b97cfa28e05..e80323ff90c1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.h
@@ -93,6 +93,7 @@ struct amdgpu_mca {
 	struct amdgpu_mca_ras mpio;
 	const struct amdgpu_mca_smu_funcs *mca_funcs;
 	struct mca_bank_cache mca_caches[AMDGPU_MCA_ERROR_TYPE_DE];
+	atomic_t ue_update_flag;
 };
 
 enum mca_reg_idx {
-- 
2.34.1